6. Using the probe
20
i
Use the gas leak detection probe to investigate the
premises/system to be tested for any concentrations
of gases.
- The detected gas concentration is indicated
visually (LEDs) and acoustically (ticker tone,
testo 330:
Alarm signal
must be switched on). The
rate of tones becomes faster as the gas
concentration rises and a constant tone is heard
when the alarm threshold is reached (testo 330:
Alarm signal
must be switched on).
In some cases it may be necessary to suppress
background concentrations of gas. This can be done up
to max. 250 ppm.
i
Activating the function: press and hold
key (large
key) until a signal tone is heard.
- Gas concentration in the ambient air between
0...250 ppm:
The gas leak detection probe sets the zero point to
the actual gas concentration in the ambient air.
Gas concentration in the ambient air greater than
250 ppm:
The gas leak detection probe sets the zero point to
the maximum suppressible gas concentration of
250 ppm.
- The LED of the set gas type flashes. This indicates
that a background gas concentration is being
suppressed.
i
Deactivating the function: press and hold
key (large
key) until a signal tone is heard.
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